The idea was only popular in the media.
Also, an "imminent ice age" is not the same thing as "global cooling."
Does that help you? In the early stages of climate research, there was some question as to which was more powerful: the "global dimming" effect of pollutants reflecting sunlight back out to space, or the enhancement of the greenhouse effect from the emission of additional greenhouse gases. So yes, both opinions existed. But the "cooling" side was always a minority and as research progressed the case for warming proved stronger.
Science progresses, dude. Somebody used to think the world was flat, but this isn't evidence that anybody today is wrong about the world's roundness.